2026 ICD-10-CM Diagnosis Code K90.821Short bowel syndrome with colon in continuity

ICD-10-CM Codes›K00–K95›K90-K95›K90

ICD-10-CM K90.821
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K90.821 is a billable ICD-10-CM diagnosis code for short bowel syndrome with colon in continuity. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 391 through 392. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 11 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified gastrointestinal disorders.

K90.821 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 66 for payment year 2026.

Code Identity

ICD-10-CM Code
K90.821
Billable Status
Yes — Valid for Submission
Code Describes
Short bowel syndrome with colon in continuity
Short Description
Short bowel syndrome with colon in continuity
Same as the full description in the CMS dataset.
Parent Code
K90.82
Short bowel syndrome

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK90-K95Other diseases of the digestive system
CategoryK90Intestinal malabsorption
This CodeK90.821Short bowel syndrome with colon in continuity

Medicare Risk Adjustment (HCC)Billing

K90.821 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
no payment category in the model that pays 100% of MA risk scores
Prior Model (CMS-HCC V24)
Not mapped under V24
this diagnosis newly risk-adjusts under the V28 model
Part D (RxHCC)
RxHCC 66 — Pancreatic Disorders and Intestinal Malabsorption, Except Pancreatitis
also risk-adjusts in the Part D prescription drug model (V08)

Source: CMS Payment Year 2026 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Short bowel syndrome with colonic continuity

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR DIG025
Other specified and unspecified gastrointestinal disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Short Bowel Syndrome

    a malabsorption syndrome resulting from extensive operative resection of the small intestine, the absorptive region of the gastrointestinal tract.

  • Short Bowel Syndrome

    malabsorption that results from the removal of a large segment of the small intestine or, less frequently, from the complete dysfunction of a large portion of the small intestine. signs and symptoms include diarrhea, steatorrhea, and weight loss.

Code History & ChangesHistory

Replacement K90.821 replaces the following previously assigned code(s):

  • K90.89 - Other intestinal malabsorption
FY 2024AddedAdded to the ICD-10-CM code setEffective October 1, 2023.
FY 2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About K90.821Overview

What is the ICD-10 code for short bowel syndrome with colon in continuity?

The ICD-10-CM code for short bowel syndrome with colon in continuity is K90.821 (sometimes written as K90821). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is K90.821 (Short bowel syndrome) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report short bowel syndrome with colon in continuity on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K90.821 group to?

When short bowel syndrome with colon in continuity is the principal diagnosis on an inpatient stay, it groups to MS-DRG 391, 392, with relative weights from 0.7796 to 1.2683 depending on complications. Higher weights mean higher Medicare reimbursement.

Is K90.821 a CC or MCC?

CMS lists K90.821 as a CC (complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 11 closely related codes in its exclusion list.

Does K90.821 risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage: K90.821 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 66 (Pancreatic Disorders and Intestinal Malabsorption, Except Pancreatitis).